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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '799259c17708c3dfbf500a02f4cf538f19b270066176f2048e4bd3dfd28b0a5a' 
  AND token = '0IJ9XQdkP2eficGpPtt26/7y4T5TYAKCjxsYu9GZ6nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}